Results 11 to 20 of about 202,014 (308)
Origin and function of the yolk sac in primate embryogenesis
Nature Communications, 2020 Why do human embryos need a yolk sac and how does it form? This Perspective by Thorsten Boroviak and Connor Ross explores the development and function of the yolk sac in primate embryogenesis.
Connor Ross, Thorsten E. Boroviak
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Morphology of the avian yolk sac [PDF]
Journal of Morphology, 2020 AbstractThe avian yolk sac is a multifunctional extraembryonic organ that serves not only as a site of nutrient (yolk) absorption, but also for early hemopoiesis, and formation of blood vessels. Although the yolk sac membrane being specialized to function as an extraembryonic absorptive organ, it is neither morphologically nor functionally part of the ...
J. M. Starck
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A review on yolk sac utilization in poultry
Poultry Science, 2020 During incubation, embryonic growth and development are dependent on nutrients deposited in the egg. The content of the yolk can be transferred to the embryo in 2 ways: directly into the intestine via the yolk stalk or through the highly vascularized yolk sac membrane. It has been suggested that, as a result of genetic selection and improved management,
van der Wagt, Ilonka +4 more
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Direct Effects of Microalgae and Protists on Herring (Clupea harengus) Yolk Sac Larvae.
PLoS ONE, 2015 This study investigated effects of microalgae (Rhodomonas baltica) and heterotrophic protists (Oxyrrhis marina) on the daily growth, activity, condition and feeding success of Atlantic herring (Clupea harengus) larvae from hatch, through the end of the ...
Björn Illing +3 more
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Yolk sac macrophage progenitors traffic to the embryo during defined stages of development
Nature Communications, 2018 Tissue-resident macrophages are derived from yolk sac progenitors but how and when these progenitors enter is unclear. Here the authors use fate mapping and intravital microscopy to track the movement of resident macrophage precursors from the yolk sac ...
C. Stremmel +21 more
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Yolk sac development, function and role in rodent pregnancy
Birth Defects Research, 2023 During the early phases of embryonic development, the yolk sac serves as an initial placenta in many animal species. While in some, this role subsides around the end of active organogenesis, it continues to have important functions in rodents, alongside ...
A. Ornoy, Richard K. Miller
semanticscholar +1 more source
Journal of Experimental Medicine, 2021 Yolk sac erythropoiesis is not replaced by hematopoietic stem cell–derived progeny up until birth. Yolk sac–derived erythroid progenitors require 10-fold lower concentrations of erythropoietin for differentiation, which confers a competitive advantage ...
F. Soares-da-Silva +8 more
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Modeling human yolk sac hematopoiesis with pluripotent stem cells
Journal of Experimental Medicine, 2021 Specific populations of immune cells in the adult develop from the embryonic yolk sac, independent of hematopoietic stem cells. Using the human pluripotent stem cell model, this study has mapped human yolk sac hematopoiesis, providing access to these ...
Michael H Atkins +6 more
semanticscholar +1 more source
Scientific Reports, 2023 This longitudinal study investigated the impact of actigraphy-measured maternal physical activity on yolk sac size during early development. The yolk sac, a transient extraembryonic organ, plays a crucial role in embryonic development and is involved in ...
Alexander Vietheer +7 more
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Primary Nasopharngeal Yolk Sac Tumor: A Case Report [PDF]
Journal of Clinical and Diagnostic Research, 2016 Yolk sac tumour also known as primitive endodermal tumour is the most common malignant germ cell tumour (GCT) in the paediatric age group. Most common sites of involvement are ovaries and testes, but rarely can occur in the extragonadal sites.
Dhanalakshmi Arumugam +4 more
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